I agree with what others have said about not needing additional buffs to powers, as cool as it might seem.
Going the other direction almost, it might be neat to explore something like "prestige levels" that some games have done where you reset to level 1 and go again. Prestige Level could display next to Veteran Level in a character's info screen, for example.
Currently, leveling is super easy, though, so I think resetting would need to increase the challenge of getting back to 50. Just some ideas:
1st Prestige Reset: No XP buffs (so no patrol XP, Experienced power, event/server XP boosts, or P2W/S.T.A.R.T. XP bonuses)
2nd Prestige Reset: Above + No XP from AE
3rd Prestige Reset: Above + Twice the amount of XP required to go from 1-50
Etc.
The clout alone would be cool, but with the Prismatic Aether system in place, having those as rewards for each time hitting 50 again might be enough incentive for folks to give it a try.
I recognize doing something like that would likely require a feat of engineering to put into place, but hey, we're all dreaming here, aren't we?